1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1ab3662d6c6904ad7fe66ffa8d9021191748f7c38813a0de4591699d2104e1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c2a6613-eaf1-4eba-ae5e-83b1f506c1d3.json and https://artists.proofprofile.net/proofs/artist/5c2a6613-eaf1-4eba-ae5e-83b1f506c1d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8e02ed9345b66966803ff374d05534270d91e5a40ca3f577475ef28513d280. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA2P1860050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cb262387127fb39d4ba78085fd7d27efdd0d314ae98a4ce31549c392766eff. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZC5T1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc85edc184d919f68c36671745885b60a514809836a3fef63ca188b2225d9cc. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZC5T1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5587ec1f98344ac741c8e53ca2989a0976d326ee096060992e54588bc7aeb444. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2130540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33860ec862c4eeb449fe80cc25d1457765f43582ca9de94b68c2ebdf21dd32b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2130541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17ade5dcfb352a3f36f20fffe3c9d254e6c8ddef6829612e510e790a2637226. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2418433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36422f55b0d0d55bd0fcb1588d89b6b540b53e7846d030fe260c15a351a490ec. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2463103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f8ff0fc66d68c6f1cc7497cf22a4d2ff984821d5555e5e1ec0699a7f4891b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ8A2463104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561b6626ff9d3a1b92c1099dad42b879bbd981203341b2fe09ccea96d6c91799. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USY242482069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e2cbbec329d6b228a109121df97ad509af3c7f3ec5431491f13dbf0d2758b1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWDE2575700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c224ccd381b41b288a0a7ce2a24a32ab65aab55c28d7a5b9cf1e72cb0a26e0. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWV32550690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac4974fc8a0bb24caae719261bbf64f2d639560ad20406381f18d0b48ed2588. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZC5T1900073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abb745c1b679c38e61f1c47ca9d43abf2fbe46b02a6ebcb914f3031d3e19c97. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6SA2101676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb209f81753b02212cba1aaf500948e44780b3e989887471f44e8565c6618384b. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6I32267947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb209f81753b02212cba1aaf500948e44780b3e989887471f44e8565c6618384b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6I32267947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603da827516938e3aae15e031409e1bd2a768d89f7e36c7fb6d494dcc2d0cee8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ72137097.